<style>
#item{ text-align: center; padding:15px; }
#item img{ max-width: 100%; }
</style>

<div id="item">
    <ul class="image" ng-show="data.length">
        <li ng-repeat="v in data">
            <img ng-src="{{v.data_url}}" />
        </li>
    </ul>
    <div class="empty" ng-show="!data.length">
        <br />
        <br />
        <br />
        <i class="iconfont icon-inothing"></i></a>
        <p>没有讲义呢~</p>
    </div>
</div>
